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How many columns does the matrix \(A=\begin{bmatrix}1&2&3&4\\5&6&7&8\\\end{bmatrix}\) have?

Answer and explanation

Correct answer: 4

For an \(m\times n\) matrix there are \(n\) columns. In this matrix each row has 4 entries and there are 2 rows, so its size is \(2\times4\) and it has 4 columns. Option A (2) is the number of rows, option D (8) is the total number of entries; option B (3) is unrelated. Exam tip: count entries in a single row or read the matrix size \((m\times n)\) to find the number of columns quickly.

Related tags

MatricesColumnsCountMatrix-DimensionsRows-And-ColumnsOrder Of A MatrixMatrixMathematics

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